A light-emitting apparatus package of the present invention includes (i) an electrically insulated ceramic substrate, (ii) a first concave section formed in the direction of thickness of the ceramic substrate so as to form a light exit aperture in a surface of the ceramic substrate, (iii) a second concave section formed within the first concave section in the further direction of thickness of the ceramic substrate so that one or more light-emitting devices are provided therein, (iv) a wiring pattern for supplying electricity, which is provided in the first concave section, and (v) a metalized layer having light-reflectivity, which is (a) provided between the light-emitting device and the surface of the second concave section of the substrate, and (b) electrically insulated from the wiring pattern. On the account of this, the light-emitting apparatus package in which heat is excellently discharged and light is efficiently utilized and a light-emitting apparatus in which the light-emitting apparatus package is used can be obtained.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A light-emitting apparatus comprising: a ceramic package; a conductive pattern formed on said ceramic package; a first light-emitting device mounted on a mounting area of said ceramic package, including an electrode electrically connected to said conductive pattern; a protective device provided on said ceramic package and electrically connected to said first light-emitting device, and a concave section formed on said ceramic package, wherein said protective device is provided within said concave section.
A light-emitting device includes a ceramic package that acts as a base. A conductive pattern (wiring) is printed on the ceramic package. A light-emitting diode (LED) is attached to a specific area on the ceramic package and is electrically connected to the conductive pattern. A protective component (like a surge protector) is also located on the ceramic package and connected to the LED for protection. The protective component sits inside a depression or indentation (concave section) formed in the ceramic package. This design helps protect the LED and other components.
2. The light-emitting apparatus of claim 1 , wherein said protective device is a capacitor element.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, a protective component inside a concave section, has the protective component specifically implemented as a capacitor. This capacitor protects the LED from voltage spikes or surges.
3. The light-emitting apparatus of claim 1 , wherein said protective device is provided on a bottom of said ceramic package.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, a protective component inside a concave section, has the protective component located on the bottom surface of the ceramic package. This can help with heat dissipation or space management.
4. The light-emitting apparatus of claim 1 , wherein said first light-emitting device is covered with a resin.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, a protective component inside a concave section, includes a layer of resin (like epoxy or silicone) that encapsulates or covers the LED. This resin layer provides environmental protection and can also act as a lens to shape the light emitted.
5. The light-emitting apparatus of claim 4 , further comprising a first wire connected between said conductive pattern and a top electrode of said first light-emitting device.
The light-emitting device, as described previously where a ceramic package houses an LED covered with resin, conductive wiring, and a protective component inside a concave section, contains a thin wire connecting the conductive wiring to the top electrode of the LED. This wire provides the electrical connection from the circuit to the LED's positive terminal.
6. The light-emitting apparatus of claim 5 , wherein said first wire is covered with said resin.
The light-emitting device, as described previously where a ceramic package houses an LED covered with resin, conductive wiring, a protective component inside a concave section, and a thin wire connecting the LED to the wiring, has the connecting wire also covered by the resin. This ensures full encapsulation and protection of the wire bond.
7. The light-emitting apparatus of claim 4 , wherein said conductive pattern is covered with said resin.
The light-emitting device, as described previously where a ceramic package houses an LED covered with resin, conductive wiring, and a protective component inside a concave section, includes the conductive wiring itself also covered by the resin. This offers increased protection against corrosion or shorts.
8. The light-emitting apparatus of claim 4 , wherein said resin is made of a transparent resin.
The light-emitting device, as described previously where a ceramic package houses an LED covered with resin, conductive wiring, and a protective component inside a concave section, uses a transparent resin to cover the LED. This allows light to escape efficiently without being blocked or diffused by the resin material itself.
9. The light-emitting apparatus of claim 1 , further comprising a metal layer buried in said ceramic package.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, and a protective component inside a concave section, incorporates a metal layer embedded within the ceramic package. This metal layer could act as a heat sink to draw heat away from the LED or as a ground plane for improved electrical performance.
10. The light-emitting apparatus of claim 1 , further comprising terminal patterns provided on a bottom of said ceramic package, wherein said terminal patterns are electrically connected to said conductive pattern.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, and a protective component inside a concave section, contains terminal patterns (electrical contacts) on the bottom of the ceramic package that connect to the conductive wiring. These terminal patterns provide an easy way to connect the device to a circuit board or power supply.
11. The light-emitting apparatus of claim 1 , wherein a depth of said concave section is larger than a height of said protective device.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, and a protective component inside a concave section, has the depth of the concave section greater than the height of the protective component (like a capacitor). This ensures that the protective component fits completely within the concave section and does not protrude.
12. The light-emitting apparatus of claim 1 , wherein a thickness of said first light-emitting device is larger than a thickness of said protective device.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, and a protective component inside a concave section, is designed so that the LED is thicker than the protective component. This might be for light output or component selection constraints.
13. The light-emitting apparatus of claim 1 , wherein said ceramic package contains aluminum nitride.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, and a protective component inside a concave section, uses a ceramic package made from aluminum nitride. Aluminum nitride is chosen for its high thermal conductivity, which helps dissipate heat generated by the LED.
14. The light-emitting apparatus of claim 1 , wherein said protective device is connected in parallel to said first light-emitting device.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, and a protective component inside a concave section, is wired so that the protective component is connected in parallel with the LED. This means the protective component shunts excess current or voltage away from the LED, preventing damage.
15. The light-emitting apparatus of claim 1 , wherein a level of said mounting area on which said first light-emitting device is mounted differs from a level of a mounting area on which said protective device is provided.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, and a protective component inside a concave section, is constructed such that the surface where the LED sits (mounting area) is at a different height than the surface where the protective component sits. This could be due to design constraints related to size or electrical characteristics.
16. The light-emitting apparatus of claim 15 , the level of said mounting area on which said first light-emitting device is mounted is above the level of the mounting area on which said protective device is provided.
The light-emitting device where the surface where the LED sits (mounting area) is at a different height than the surface where the protective component sits, the mounting area of the LED is specifically higher than the mounting area of the protective device. This height difference may affect light extraction or wire bonding.
17. The light-emitting apparatus of claim 1 , further comprising a second light-emitting device mounted on said mounting area of said ceramic package, including said electrode electrically connected to said conductive pattern.
The light-emitting device, as described previously where a ceramic package houses an LED, conductive wiring, and a protective component inside a concave section, also includes a second LED mounted on the ceramic package. The second LED is electrically connected to the same conductive wiring. This allows for multiple LEDs in a single package.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
December 7, 2015
September 19, 2017
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